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eth, les, geth: implement cli-configurable global gas cap for RPC calls (#19401)

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* eth, les, geth: implement cli-configurable global gas cap for RPC calls

* graphql, ethapi: place gas cap in DoCall

* ethapi: reformat log message
This commit is contained in:
Martin Holst Swende
2019-04-08 13:49:52 +02:00
committed by Péter Szilágyi
parent ed97517ff4
commit e2f3465e83
9 changed files with 42 additions and 13 deletions
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20
internal/ethapi/api.go
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@ -674,7 +674,7 @@ type CallArgs struct {
Data *hexutil.Bytes `json:"data"`
}
func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config, timeout time.Duration) ([]byte, uint64, bool, error) {
func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber, vmCfg vm.Config, timeout time.Duration, globalGasCap *big.Int) ([]byte, uint64, bool, error) {
defer func(start time.Time) { log.Debug("Executing EVM call finished", "runtime", time.Since(start)) }(time.Now())
state, header, err := b.StateAndHeaderByNumber(ctx, blockNr)
@ -697,6 +697,10 @@ func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumb
if args.Gas != nil {
gas = uint64(*args.Gas)
}
if globalGasCap != nil && globalGasCap.Uint64() < gas {
log.Warn("Caller gas above allowance, capping", "requested", gas, "cap", globalGasCap)
gas = globalGasCap.Uint64()
}
gasPrice := new(big.Int).SetUint64(defaultGasPrice)
if args.GasPrice != nil {
gasPrice = args.GasPrice.ToInt()
@ -752,11 +756,11 @@ func DoCall(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumb
// Call executes the given transaction on the state for the given block number.
// It doesn't make and changes in the state/blockchain and is useful to execute and retrieve values.
func (s *PublicBlockChainAPI) Call(ctx context.Context, args CallArgs, blockNr rpc.BlockNumber) (hexutil.Bytes, error) {
result, _, _, err := DoCall(ctx, s.b, args, blockNr, vm.Config{}, 5*time.Second)
result, _, _, err := DoCall(ctx, s.b, args, blockNr, vm.Config{}, 5*time.Second, s.b.RPCGasCap())
return (hexutil.Bytes)(result), err
}
func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber) (hexutil.Uint64, error) {
func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.BlockNumber, gasCap *big.Int) (hexutil.Uint64, error) {
// Binary search the gas requirement, as it may be higher than the amount used
var (
lo uint64 = params.TxGas - 1
@ -773,13 +777,17 @@ func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.Bl
}
hi = block.GasLimit()
}
if gasCap != nil && hi > gasCap.Uint64() {
log.Warn("Caller gas above allowance, capping", "requested", hi, "cap", gasCap)
hi = gasCap.Uint64()
}
cap = hi
// Create a helper to check if a gas allowance results in an executable transaction
executable := func(gas uint64) bool {
args.Gas = (*hexutil.Uint64)(&gas)
_, _, failed, err := DoCall(ctx, b, args, rpc.PendingBlockNumber, vm.Config{}, 0)
_, _, failed, err := DoCall(ctx, b, args, rpc.PendingBlockNumber, vm.Config{}, 0, gasCap)
if err != nil || failed {
return false
}
@ -797,7 +805,7 @@ func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.Bl
// Reject the transaction as invalid if it still fails at the highest allowance
if hi == cap {
if !executable(hi) {
return 0, fmt.Errorf("gas required exceeds allowance or always failing transaction")
return 0, fmt.Errorf("gas required exceeds allowance (%d) or always failing transaction", cap)
}
}
return hexutil.Uint64(hi), nil
@ -806,7 +814,7 @@ func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNr rpc.Bl
// EstimateGas returns an estimate of the amount of gas needed to execute the
// given transaction against the current pending block.
func (s *PublicBlockChainAPI) EstimateGas(ctx context.Context, args CallArgs) (hexutil.Uint64, error) {
return DoEstimateGas(ctx, s.b, args, rpc.PendingBlockNumber)
return DoEstimateGas(ctx, s.b, args, rpc.PendingBlockNumber, s.b.RPCGasCap())
}
// ExecutionResult groups all structured logs emitted by the EVM